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https://github.com/systemd/systemd-stable.git
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ac77e95948
Seems we find the md signature in cpu-order on the disk. Let's look for both endian encodings ... Thanks to Michael Prokop for his help finding the bug.
85 lines
2.0 KiB
C
85 lines
2.0 KiB
C
/*
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* volume_id - reads filesystem label and uuid
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*
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* Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation version 2 of the License.
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*/
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#ifndef _GNU_SOURCE
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#define _GNU_SOURCE 1
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#endif
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#ifdef HAVE_CONFIG_H
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# include <config.h>
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#endif
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <string.h>
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#include <errno.h>
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#include <ctype.h>
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#include "libvolume_id.h"
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#include "util.h"
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static struct mdp_super_block {
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uint8_t md_magic[4];
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uint32_t major_version;
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uint32_t minor_version;
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uint32_t patch_version;
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uint32_t gvalid_words;
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uint32_t set_uuid0;
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uint32_t ctime;
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uint32_t level;
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uint32_t size;
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uint32_t nr_disks;
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uint32_t raid_disks;
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uint32_t md_minor;
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uint32_t not_persistent;
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uint32_t set_uuid1;
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uint32_t set_uuid2;
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uint32_t set_uuid3;
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} PACKED *mdp;
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#define MD_RESERVED_BYTES 0x10000
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#define MD_MAGIC "\xfc\x4e\x2b\xa9"
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#define MD_MAGIC_SWAP "\xa9\x2b\x4e\xfc"
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int volume_id_probe_linux_raid(struct volume_id *id, uint64_t off, uint64_t size)
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{
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const uint8_t *buf;
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uint64_t sboff;
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uint8_t uuid[16];
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info("probing at offset 0x%llx, size 0x%llx",
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(unsigned long long) off, (unsigned long long) size);
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if (size < 0x10000)
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return -1;
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sboff = (size & ~(MD_RESERVED_BYTES - 1)) - MD_RESERVED_BYTES;
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buf = volume_id_get_buffer(id, off + sboff, 0x800);
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if (buf == NULL)
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return -1;
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mdp = (struct mdp_super_block *) buf;
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if ((memcmp(mdp->md_magic, MD_MAGIC, 4) != 0) &&
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(memcmp(mdp->md_magic, MD_MAGIC_SWAP, 4) != 0))
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return -1;
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memcpy(uuid, &mdp->set_uuid0, 4);
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memcpy(&uuid[4], &mdp->set_uuid1, 12);
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volume_id_set_uuid(id, uuid, UUID_DCE);
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snprintf(id->type_version, sizeof(id->type_version)-1, "%u.%u.%u",
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le32_to_cpu(mdp->major_version),
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le32_to_cpu(mdp->minor_version),
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le32_to_cpu(mdp->patch_version));
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dbg("found raid signature");
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volume_id_set_usage(id, VOLUME_ID_RAID);
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id->type = "linux_raid_member";
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return 0;
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}
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